prop.
 

I have a Evolution .46NT it says to use a 11/6 prop. But I can get a great deal on some 11/7 can I use them on my PT-40 MKII.

RE: prop.
 

You can use an 11/7 BUT the plane will be faster, and at higher speed it will be more sensitive to control input, and last but absolutely not least she may have a more difficult time landing. Trainers kind of float anyway with more thrust at idle you may find yourself forcing it down, and that is no fun.

I went from a 12/6 to a 13/6 on my hobbistar 60 and landing is now an event lol she comes in a little hotter :)

RE: prop.
 

That being said I think I read somewhere that a hobbistar IS NOT in the same league as far as trainers go, it has less dihedral and is faster then most trainers and not really on the ideal trainer list.

RE: prop.
 

11x7 is kinda big for a .46, a 11x5 or 11x6 would be the best, the 11x7 will be slower as the engine will not rev as high as with a 11x5 or 6 and has the possiblility of overheating that engine. I personally use a 12x4 on my .46's but for a trainer style plane i'd go the 11x5 or a 11.5x5.

RE: prop.
 

11x7 goes well on low end 60 size motors.

my guess is with 11x7 you will get less max RPM then with 11x6 or 11x5.
if you insist on 7 pitch or speed then my guess would be 10x7 prop.

but why this speed props on a trainer there is no problem of slow speed flight with trainers, you want it to fly slow and with low pitch and pull up strong from low RPM.

RE: prop.
 

Rule of thumb, longer prop with lower pitch= less speed and more thrust, smaller prop more pitch=less thrust but more speed. On a .46 sitting on a trainer you will probably never notice any speed difference between an 11X6 to an 11X8. I think the prop range on that engine is 10X7 to 11X8?? The owners manual will give you the starting points and you have to test the props until you find the one that you like the best. When I was still flying .46 engines in fun fly planes I ended up with the 11X6 APC as my starting point. On trainers I like to use the Master Air Screw props, they take ground strikes a lot better then any other prop I have used.

RE: prop.
 

The plane will fly with the 11-7 but would be better with the props these gentlemen are suggesting